After years of accusing states of “voter suppression,” the Center for American Progress wants to make it tougher for overseas military to vote in the name of election security.

The left-wing public-policy group issued Monday a report, “Election Security in All 50 States,” that called for stricter standards to prevent cyber-meddling in elections by foreign governments, including banning military stationed abroad from submitting ballots via email or fax.

One state that allows such vote-casting is Colorado. The center called on the state to “prohibit voters stationed or living overseas from returning voted ballots electronically.”

“Regardless of the state’s secure ballot return system for electronically voted ballots, we recommend that all voted ballots be returned by mail or delivered in person,” said the 245-page report.

Colorado Secretary of State Wayne Williams defended the practice, saying the state has incorporated safeguards to protect the integrity of ballots cast by military personnel living overseas.

“They don’t believe someone who works on a submarine should be allowed to vote. We do,” said the Republican Williams in a statement.

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Conservatives were quick to blast the report’s recommendation as unworkable and politically motivated.

“Perhaps they think that Navy SEALS can swim ballots ashore, hand them off to Army paratroopers who can parachute into Colorado to drop off the ballots?” asked the conservative website Colorado Peak Politics.

“You can bet that if the military historically voted Democrat instead of Republican, the Center for American Progress would not have a problem with it,” added Peak in a Monday post.

The report comes as something of a departure for the center, given its record of fighting for greater ballot access, including same-day registration and making it easier for felons to vote, and against tighter rules aimed at combating voter fraud.